QuiQue's Aircraft Yak-54S Assembly Manual

Semi Scale Yak-54S, ARF 85”

ASSEMBLY MANUAL

Specifications

Wingspan: 85 in

Length Including Spinner: 78.5 in

Wing Area: 1,320 sq in

Weight (RTF): 15.5-17 lb

Radio: 4-6 Channel W/6 Servos

Recommended Engines:

Gas 50-75cc

Table of Contents

Quique’s Aircraft Company 3

Covering Colors 4

Going Over the Covering 4

Hardware Supplied 5

Additional Required Tools and Adhesives 6

Servo Selection 7

Using the Manual 7

Warning 7

Warranty Information 7

Section 1-Preparing Fuselage 8

Section 2-Horizontal Stab Installation 9

Section 3-Elevator, Rudder and Aileron Control Horn Installation 11

Section 4-Preparation and Installation of Hinges 14

Section 5-Wing Anti-Rotation Pins and Servo Installation 18

Section 6-Tail Wheel Installation 21

Section 7-Elevator Servo Installation 22

Section 8-Rudder Servo and Pull/Pull Installation 24

Section 9-Engine Mounting 26

Section 10-Landing Gear Installation 30

Section 11-Fuel Tank Installation and Engine Box Completion 32

Section 12-Engine Cowling 35

Section 13-Canopy Installation 37

Section 14-Radio Equipment 39

Balancing the Model 42

Control Throws 43

Preflight at the Field 46

2

Quique’s Aircraft Company

3410 Saint Paris Pike

Springfield, OH 45504

Phone: (937) 629-0339

Fax: (937) 629-0335

Email: [email protected]

Website: www.Somenzini.com

www.QQAircraft.com

Online-Support:http://www.rcuniverse.com/forum/forumid_437/tt.htm

Quique and I want to express our thanks to you for choosing our 85” Yak-54 S.

We think that you will enjoy one of the best flying model aerobatic airplanes

available. It is patterned after the 37% Yak-54 which took First Place honors at

the 2003 Free Style Championships in Lakeland Florida, First Place at the Don

Lowe Master competition 2003 & 2004, First Place Tucson Shoot Out 2004 Free

Style, First Place XFC 2004, precision and free-style and Third Place at the

Tournament of Championships in Las Vegas in 2002.

Quique and I have tried to prepare the best assembly manual possible along with

best support on our line of Aircrafts. We are happy to announce that we have a

support forum on www.Rcuniverse.com that is being led by

Mr. Reza Gholamipour. Imagine, you are building your plane during weekend

when we are close and you desperately need to get answer to your question so

you can continue building, well we are happy to tell you that your question is

most likely answered on Rcuniverse forum that we handle, if not, just post your

question and have the answer in matter of hours.

Good flying to you!

Quique & Wayne

3

Covering Colors

Ultra-cote covering used on this 85” Yak-54 S can be purchased from Horizon

Hobbies Website. The codes are as follows:

 Deep Blue Hanu873

 True Red Hanu866

 White Hanu870

 Bright Yellow Hanu872

Going Over the Covering

Before beginning the assembly of your Yak-54 S, remove each part from its bag

for inspection. If you find any wrinkles in the covering, use a heat gun or covering

iron to remove them. Use caution while working around areas where the colors

overlap to prevent separating the colors. Make sure you go over the edges with

your iron as well.

4

Hardware Supplied

Pull/Pull Rudder

26 Hinges and Wing pins/clips Tail Wheel

Aileron/Elevator Titanium rods & ball links

Fuel Tank DA50/3W50 Engine Template & stand offs

for 3W engine

Cowl and Canopy hardware

Optional Dubro Hardware to complete your Assembly:

Wheels and Axles

Control Horn System

5

Additional Required Tools and Adhesives

• Covering/Trim iron

• Xacto knife, #11 blade

• Pacer hinge glue (PT-55)

• 5, 15 and 30-minute epoxy

• Petroleum jelly/Lithium grease

• Acetone/Alcohol swabs

• Felt-tip marker

• Pencil and Marker

• Ruler

• Drill

• Drill bit 1/16”,1/8”, ¼”, 3/16”, #33, #25, #54

• Wire cutter

• Course and fine sandpaper

• Thin, medium and think C/A

• Full threaded servo mounting screws

• Sullivan inner nyrod

• Pliers

• Masking tape

• Ultra fine point sharpie

• Electrical tape

• Double-sided tape

• Small sheet metal screws

• Rat-tail file

• Pin vise

• Round toothpick

• Velcro

• Thread Locker

Extensions:

• (2) 18” servo extensions for Ailerons

• (2) 24” servo extension for Elevators

• (2) 3” servo extension from receiver to Ailerons

6

Servo Selection

The servos used for the control surfaces of this Yak-54 S must have a minimum

of 180 ounce-inch of servo torque. In the prototype Yak-54 S, we used JR8611

on all control surfaces and on throttle we used one standard JR servo. Best

results can be obtained by using digital servos. Please do not risk your plane by

using low torque servos. This Yak-54 S has large control surfaces and fully

capable of any maneuvers that a pilot is able to perform, therefore using weak

servos will increase chance of flutter and can cause you crash.

Using the Manual

This manual is divided into sections to help make assembly easier to understand

and to provide breaks between each major section. Remember to take your time

and follow the directions.

Warning

I am sure that for the most of you this is not your first venture into the World of

flying radio controlled aircraft. For those of you that may be entering this exciting

sport early on in your modeling experience and for you with vast experience, I

think we all need to be reminded of the possible dangers that are associated with

a high performance aircraft of this type. This is not a toy. This aircraft must be

flown in a safe manner at all times. You should always do a preflight check

including control surfaces hook-ups, radio operation, (please refer to your radio

equipment instruction manual for range checks and other pertinent related

information) and all other checks relating to the safe operation of this aircraft.

Warranty Information

Quique’s Aircraft Company guarantees this kit to be free from defects in both

material and workmanship at the date of purchase. This warranty does not cover

any parts damaged by use or modification. In no case shall QQAC’s liability

exceed the original cost of the purchased kit.

7

Section 1-Preparing Fuselage

Required Tools and Adhesive

• Xacto knife, #11 Blade

• Trim Iron

Step 1

Use a Xacto knife with a # 11 blade

and cut away the film covering on

both sides of the fuselage for the

wing openings, Figure 1.

Some modelers may want to overlap

the film covering down inside the

fuse in the opening for the wing. For

example this type of an opening for

the wing may be done as follows.

Simply cut the film about 1/8 of an

inch to the inside of the opening for

the wing. You may then bend this

extra 1/8 inch flap of film over ninety

degrees to the inside of the fuse

opening and iron it to the edge of the

balsa sheeting over the foam. Use

the trim iron for this application. Do

not touch the foam, bead board, with

your trim iron. Watch how much

heat you use here as too much will

melt the foam.

Figure 1

Step 2

Cut the film on the horizontal stab

openings, both elevator servo

openings and the slots for the rudder

cables. There is a hole on the right

side of the fuse just opposite of

opening on the left side however it is

a lightning hole and a little smaller

than a hole required for a servo and

doesn’t have the servo plate when

you look inside the fuse.

Figure 2

8

Section 2-Horizontal Stab Installation

Required Tools and Adhesive

• Ultra fine point Sharpie

• Acetone

• Xacto knife, #11 Blade

• Felt tip marker

• Thin and thick C/A

Step 1

Center the H. Stab so that the left tip

and right tip are equal distance from

the fuselage sides. See Figure 3.

Figure 3

* Above picture doesn’t show your plane color

scheme.

Step 2

Square up the H. Stab by measuring

the diagonal distance from the turtle

deck to the back corners (left and

right) of the H. Stab. They must be

the same distance. See Figure 4.

Figure 4

Step 3

Mark lines on both sides of the H.

Stab top and bottom with a fine felt

tip black marker, an Ultra Fine Point

Sharpie ® works well in this

application. Later when you are

ready to remove the black lines,

acetone works best.

Step 4

Remove the H. Stab from the fuse.

Mark a line, measured 1 mm on the

inside of the two lines top and

bottom that you marked along the

right and left sides of the fuse.

9

Step 5

Use a new # 11 blade and gently cut

through the ultra cote. See Figure 5.

There are two layers, cut through the

top layer first and remove it. You

have probably cut through the

second layer. If not you may cut

through the second layer. Be very

careful not to cut into the balsa

sheeting as this will weaken the

structure of the Horizontal Stab as

the skin sheeting is important to its

structural integrity. See Figure 5.

Figure 5

Step 6

Use your iron to seal down the Ultra-

cote where you removed the center

section before you make the final

attachment.

Step 7

Re-insert the H. Stab into the

fuselage. IMPORTANT: Check the

measurements again, see Figure 3 &

Figure 4 to make sure the H. Stab is

square.

Step 8

Position the plane in knife edge, like

figure 6 and apply thin C/A. Do this

couple of times. Then after glue

dried flip the plane to the other side

and do the same thing.

Figure 6

Step 9

Apply thick C/A to make sure you

filling any gap that may still exist

10

Section 3-Elevator, Rudder and Aileron Control Horn Installation

Required Tools and Adhesive

• Xacto knife, #11 Blade

• 5-minute epoxy

• Alcohol Swab/Alcohol and

paper towel

Elevator Horn Installation

Step 1

Locate the elevator control horn hole

that is covered by ultracote. Remove

the covering by xacto knife.

Step 2

Iron around the hole that Dubro nut

and washer to be seated and then

apply a small amount of thin around

that area for extra strength. Don’t

add too much because you will have

problem sitting the nut and washer.

Step3

Insert the Dubro Heavy Duty Control

Horn System, Cat. No. 866. Insert

the 2“, 8-32 through the top of the

elevator. Take the screw out and

apply a thin layer of epoxy inside the

hole. Wait until epoxy is hardened.

Step 4

Reinsert the 2“, 8-32 provided

through the top of the elevator going

through the black washer provided in

the same package.

Figure 7

Step 5

Screw the Dubro nut piece so it is

flush with the top of the 8-32 control

horn. Note that don’t over tighten the

screw because you will crush the

balsa on your elevator.

Figure 8

11

Rudder Control Horn Installation

Step 1

Locate the pre-drilled rudder control

horn hole that is covered by

ultracote. There are two holes, the

more forward one is the one you

need to remove the covering by

xacto knife.

Step 2

Use the Dubro heavy duty dual pull-

pull system Cat. No. 883. Insert the

8-32 threaded rod for the rudder

control horn.

Step 3

Take the screw out and apply a thin

layer of epoxy inside the hole to

strengthen the inside walls.

Step 4

Proceed with final installation of

Dubro Cat. No 833. See Figure 9.

Figure 9

Aileron Horn Installation

Step 1

Locate the aileron control horn hole

and servo location that is covered by

ultracote. Remove the covering by

xacto knife.

Step 2

Iron around the hole that Dubro nut

and washer to be seated and then

apply a small amount of thin CA

around that area for extra strength.

Don’t add too much because you will

have problem sitting the nut and

washer.

Step 3

Insert the screw provided to open up

the control horn hole completely.

Step 4

Take the screw out and apply a thin

layer of epoxy. Wait until its

hardened.

Step 5

For the control horns use the Dubro

Heavy Duty Control Horn System,

Cat. No. 866 and complete the

installation as pictured. Make sure

that servo output shaft is towards the

hinge line.

12

Figure 10

13

Section 4-Preparation and Installation of Hinges

Required Tools and Adhesive

• Xacto knife, #11 Blade

• Lithium grease/Petroleum Jelly

• Toothpicks

• Pacer hinge glue (PT-55) or

30-minute epoxy

The hinge slots are already installed in the balsa hinge locations on both the

fixed surfaces and the moveable surfaces. However they are covered up with the

covering film so they may be a little difficult to see and locate. Look closely and

you will find the hinge holes. I find them more easily by running my finger along

the edge where the hinges are located. You should feel a little depression in the

film at the opened slots under the film.

Number of slots and hinges per control surface are as follows:

Aileron 8 (See Figure 11)

Elevator 3

Rudder 4

Figure 11

14

Step 1

Use a # 11 blade to open the flat

hinge slot.

The hinge slots will have to have a

larger opening cut out just on either

side, top and bottom, of the pivot

point on both surfaces. So you will

need to open the area in the fixed

and moveable surfaces of the

ailerons, elevators and rudder.

Step 2

Use a #11 blade and make a wedge

tapered opening to accept the

pinned hinge area of the hinge. See

Figure 12 & 13.

Figure 12

Figure 13

Step 3

Make a V- cut in the fixed and

control surface area along the slot

location of the flat hinge. This

additional V- slot will insure that the

hinge will insert far enough into the

hinge slot so it is in the proper

location and provide enough depth

for each hinge. The gap between the

flying surface and the control surface

needs to be at a minimum. However

we have to have enough of a gap so

full deflection is possible.

Step 4

Check the gap on each control

surface. The gap should be

somewhere between 2 and 3 mm.

This procedure will take some time

to do all of the hinges but take your

time and do a nice job. As you do

each hinge and check out the proper

depth and shape of the V-slot

necessary for each hinge, the time

involved to do each subsequent

hinge will lessen.

Before you glue the hinges in

place:

Dry fit the control surfaces to fixed

surfaces. Make sure everything is

lined up. In case of elevator make

15

sure that there is not much space

between the elevator tips and tips of

the horizontal stab. See Figure 14.

Figure 14

Take some lithium grease or

Petroleum jelly and apply a very

small amount on both sides of the

hinge point on the flat hinges.

Quique used a round toothpick. See

Figure 15. This will help prevent any

glue in the pivot point.

Be very careful not to get any grease

etc. on the flat part of the hinges.

Also remember that you always glue

the hinges in to the fixed surfaces

first, let the glue harden before you

then glue in the control surfaces.

Remember to check for the correct

hinge gaps for rudder, elevators and

ailerons. You must have the correct

gap to insure the maximum control

deflection necessary for the best 3-D

aerobatics. For hinge attachment we

like to use Hinge Glue by Pacer.

You may use epoxy if you wish. If

you use epoxy, use an epoxy with a

curing time that will give you enough

time to work the hinges in place

before the epoxy hardens.

Figure 15

Step 5

Sealing the Control Surfaces

After you are done hinging the

ailerons and elevators, make sure

you seal the hinge line by using clear

ultracote or bright yellow ultracote for

best appearance. Unsealed control

surfaces may cause flutter like

aileron flutter, which may cause your

plane to crash, where sealed control

surfaces will give you better and

crisper response in flight.

For each aileron, cut 36 ½”x1” of

bright yellow ultracote and seal the

hinge line from top using a straight

edge and trim iron.

For each half elevator, cut 11

7/8”x1/2” of bright yellow ultracote

and seal the hinge line from top

same way as you did your ailerons.

Following figures show what it would

look like if you use bright yellow

ultracote to seal the hinge line from

top.

16

Figure 16

Figure 17

Figure 18

17

Section 5-Wing Anti-Rotation Pins and Servo Installation

Required Tools and Adhesive

• 5-15 minute epoxy

• Ruler

• Coarse sandpaper

• Acetone/Alcohol swab

• Thin C/A

• Micro balloons

• (2) 18” servo extensions

• Wheel color/Weight

• String

• (2) 1.25” Airwild/Similar

aluminum servo arms

Step 1

Prepare the aluminum anti-rotation

pins by using coarse sandpaper and

rough up the end of the pin where it

will be inserted in the second rib in

the wing. Now clean the pins with

acetone or alcohol to remove any

possible grease or dirt.

Step 2

Install the anti-rotation pins using the

following dimensions. Both the front

pin and back pin should measure

10.5mm. Note: the picture showing

the measurement with the ruler may

not look like exactly 10.5 however

10.5 mm is the correct distance from

the root rib to the center hole for the

keeper clip at the end of the anti-

rotation pin. Also this ruler starts at

zero, yours may not start at zero.

The front pin should have the hole in

a horizontal position and for the rear

pin, the hole should be vertical.

Figure 19

Figure 20

Step 3

Apply 5-minute epoxy in the second

wing rib holes. Lay the wing flat on

the table to insert the anti-rotation

pins. Now insert the pins to the

correct depth. Again, check the hole

in the end of the pins to make sure

the front pin is horizontal and the

rear pin is vertical as this is very

important

Step 4.

Let the epoxy harden. Stand the

wing on its wing tip and run some

thin C/A around the pin at the root

rib. Wipe away any excess. Do this

18

several times which will help to seal

the pin to the hole in the root rib.

Step 5

After the C/A has hardened, make a

fillet of 10 or 12 minute epoxy and

micro balloons and apply on the

inside of the root rib. I used a small

length of 3/16” wooden dowel to

apply the epoxy-micro balloon mix.

Figure 21

Figure 22

Step 6

You will find some ¼” I.D. O-rings

and fiber fender washers with the

wing anti-rotation package of parts.

Use thin C/A and glue the O-ring to

the fiber washer. After you have

installed the wings to the fuse you

will use this O-ring and fiber washer

to slide over the anti-rotation pin

before you put the keeper clip in the

hole in the anti-rotation pin.

Figure 23

Figure 24

Step 7

Now install the aileron servos.

Step 8

Plug a 18" servo extension onto the

servo. Either tie the servo leads

together, using a commercially

available connector, or use unwaxed

dental floss to secure the extensions

to prevent them from coming

loose during flight.

19

Step 9

Tie a weight to a piece of string. A

wheel collar works great in this

application. Lower the string into the

wing from the aileron servo opening.

Hold the wing with the tip upwards

and let the weight drop out through

the wing root for the servo.

Step10

Tie the string to the servo extension

and insert the servo into the wing.

Use the string to pull the servo

lead through the wing. Position the

servo so the output shaft is towards

the trailing edge of the wing.

Use a 1/16" drill bit to drill the

locations for the servo screws.

Mount the servos using the hardware

provided with the servos.

Step 11

Use 1.25” aluminum servo arms

such as Airwild 1 ¼” aluminum arm.

Step 12

Measuring from hinge line vertically

to pivot point on the Dubro Control

Horn connector should be at 1 ¼

inches for the proper amount of

aileron throw. Hook the servo arm to

the control horn using the provided

4/40 titanium rods.

Use provided ball links to complete

the installation.

Figure 25

Step 13

Make a quick check to see if the

servo direction is correct. Make sure

the aileron sub trim and trim at your

radio program are at zero. Once it is

at zero install the servo horn to be

perpendicular to the main servo axis.

If you find the servo horn is not

perfectly perpendicular, slightly

adjust it with the subtrim (Center).

Once all of this is done, adjust the

pushrod to the proper length to set

the aileron surface at a perfectly

neutral position. With your radio set

at high rate and traveling set at

maximum, check full deflection right

and left. Do the same thing with both

wing panels. It is very important

both ailerons travel the same

distance up and down, if not it is

called aileron differential. This 85”

Yak-54 will not need any differential

so make sure that both ailerons are

traveling the same distance up and

down. If the ailerons are not traveling

the same distances up and down,

then the aileron rolls will not be clean

and axial and will look more like

barrel rolls. Remember it is important

to have the servo arm perpendicular

to the main axis of the servo and the

sub trim and trim of your radio at

zero. This will make the job much

simpler.

20

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QuiQue's Aircraft Yak-54S Assembly Manual

QuiQue's Aircraft Yak-54S Assembly Manual

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